Where to get diff done ????

**swampy** · 12-04-2018, 04:02 PM

Hi
As the title suggests 9inch eaton custom axles suit HQ rear disc
No aussie backyard machined axles .
Most places only use off the shelf axles ...

CDS in Adelaide
John Taverna in Melb a lot dearer than above

I`m impressed with both but small but important details not quite right .
Although not willing to trade to lower quality just better fit for me .

This applies to many quotes you would be surprised how many people don't listen .

What places can people recommend either of above or somewhere different ???????

**Xjas** · 16-04-2018, 08:46 PM

I've used Craft diffs in Sydney years ago and the service was awesome.

**Castiron355** · 16-04-2018, 09:43 PM

David Bosnjak Engineering and Differentials

**desoto30** · 17-04-2018, 09:27 AM

There are any number of "diff makers" in Australia {including myself] most are good some are excellent, surely there is one in or near Nth Q that would do what you want

**swampy** · 17-04-2018, 11:34 AM

Hi
Mainly the dilemma is axle manufacturing . In regards to quoting ,some will only give quotes on scribble pad ,some give quote on 5 words price and 9 inch etc , many try to sell u stuff u don't need or no name gear , some outright guess .
I no , I'm not alone in receiving poor service but geeeez I'm getting stuffed around .

Who makes custom axles ??? diff housing centre etc

**Castiron355** · 17-04-2018, 01:47 PM

Originally Posted by swampy

Hi
Mainly the dilemma is axle manufacturing . In regards to quoting ,some will only give quotes on scribble pad ,some give quote on 5 words price and 9 inch etc , many try to sell u stuff u don't need or no name gear , some outright guess .
I no , I'm not alone in receiving poor service but geeeez I'm getting stuffed around .

Who makes custom axles ??? diff housing centre etc

David Bosnjak "Engineering" and Differentials

**VK 4.9** · 06-05-2018, 04:53 PM

Next Gen Racing in Melbourne. Have done great work for myself and others

**Gregaust** · 06-05-2018, 05:19 PM

Haven't we been over this before ????

**swampy** · 07-05-2018, 09:23 AM

HI
Discussed B4 but no real result .

VK 4.9
will checkem out thanks

Generally
I am astounded at the personal biased unfounded opinions the diff places offer up . This may well be different to your needs >>> leads to WTF .

Diff features I have had trouble with
rear brakes don't use them use these upsell bS , WTF
14 inch wheels ,,,15 inch only WTF
axle quality welding on adapters WTF

Basically everything that the diff builders have something to do with .

Can some one confirm ,when u weld to an axle face [axle is already hardened ] ,the weld may eventually crack out correct = brittle ?????

**guy incognito** · 07-05-2018, 09:59 AM

No disrespect intended but you sound like a pain in the arse and this may be affecting the quality of advice you receive from builders.

It's a diff, not the space shuttle.

What diff specs do you actually want, list it here.

**swampy** · 07-05-2018, 02:02 PM

Hi
No pain here Ha Ha
Just want a diff built
Common comment is either vn commo rear disc [ why because they only use of the shelf axles cannot accommodate neck length which would be custom ]
Run Willwood or commo VT/on rear disc 15 inch wheel doh !!!!

The above leaves me with only 2-3 places in OZ.

Last time I checked its not a good idea to weld to a hardened surface ???

Offset diff pinion anyone ???

So diff industry has a few issues

**guy incognito** · 07-05-2018, 02:27 PM

I'm still slightly confused.

Do you want a 9" built with centred pinion and the ability to use standard rear discs (which means custom axles) and you can't find anyone who will build it?

Sedan or ute?

**swampy** · 07-05-2018, 07:31 PM

HI
HQ sedan
Centred pinion would be nice . The only reason to do that is exhaust / muffler clearance to t/shaft .[desirable] Many places diffs will only do offset . THE REAL question is do u run into clearance problems from a 4 inch shaft to tunnel running ZERO offset ?????????. This also comes down to critical speed of tail shaft in regards to diameter . Bigger is best Above this vibration vibration occurs .

Rear factory discs present an issue for most diff places . Neck to flange DISTANCE AROUND 48MM supposedly . Very short and off the shelf donot fit .
Then we get to centre bore HZ run 13mm and WB run 26mm . To achieve this some want to weld custom hardened axles . I think this is a no no ??

The resolution is to run 10mm pinion offset possibly ??

Bolt on centre bore extensions , these might be-able to doweled or shrink fit .????
After market axles can only come to certain sizing . I think bullshit to the industry . Has more to do with being in Ozzy [limited resources ] than the USA . Ozzy stores just want to use there stock and not make to suit geez actually make a custom axle !!!!!

**Castiron355** · 07-05-2018, 07:49 PM

Only out of curiosity. Did you try David Bosnjak Engineering and Differentials?

**swampy** · 08-05-2018, 05:41 AM

HI
Cast Iron 355
Phoned David Bos He was offering a different brake setup different diff set up . Pricing for billet axles was many more $$$ than others . He is up the list . Good info from him .

Re centre bore /wheel locator
Just rang Strange cannot weld to face of axle once hardened, cracking and failure results
bolt on centre bore extension te only way

Axle offset
neck length /brake offset is not something they do so small eg 48mm
cannot machine thru hardening it will be weakened